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Phylogeny and Classification of Euglenophyceae

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Phylogeny and Classification of Euglenophyceae REVIEW published: 16 March 2016 doi: 10.3389/fevo.2016.00017 Phylogeny and Classification of Euglenophyceae: A Brief Review Carlos E. de M. Bicudo 1* and Mariângela Menezes 2 1 Department of Ecology, Instituto de Botânica, São Paulo, Brazil, 2 Phycology Laboratory, Botany, Museu Nacional, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil Euglenophyceae (phototrophic euglenids) are an important lineage within the Euglenida, Euglenozoa. Most of the approximately 3000 described species are free-living, phototrophic, unicellular flagellates with one to several plastids of secondary origin, three bounding membranes and chlorophylls a and b; but, the lineage also includes colorless species that lost their photosynthesizing capability. They show a typical cell membrane consisting of parallel proteinaceous strips and microtubules located underneath the plasma membrane, and discoid mitochondrial cristae. Euglenozoa are a monophyletic group that includes, besides Euglenida, the Kinetoplastidea, Diplonemea, and Symbiontida. Since the class Euglenophyceae was proposed, its classification system has undergone several revisions, mainly after the adoption of molecular techniques. This article summarizes recent advances in the phylogeny and classification of the phototrophic euglenids, aiming at understanding the situation of the group within the phylum Euglenozoa, as well as its evolutionary relationships and the changes in its Edited by: taxonomic classification. The current status of the group, as well as the limitations derived Jan Maria Kwiatowski, from the lack of inclusion of tropical strains in phylogenetic studies is briefly discussed. University of Warsaw, Poland Keywords: Euglenophyceae, molecular biology, morphology, phylogeny, taxonomy Reviewed by: Alberto G. Sáez, Instituto de Salud Carlos III, Spain Anna Karnkowska, INTRODUCTION University of British Columbia, Canada *Correspondence: The class Euglenophyceae includes phototrophic members of the Euglenida, supergroup Excavata, Carlos E. de M. Bicudo being a frequent component of the plankton in marine, brackish, and freshwater environments. [email protected] The class encompasses free-living phototrophic unicellular flagellates, with one to several plastids of secondary origin, with three bounding membranes and chlorophylls a and b; but, it also Specialty section: includes colorless species that lost their capability to photosynthesize as well as the photosensory This article was submitted to apparatus associated with cilia (secondary osmotrophic species). The Euglenida (euglenids), Phylogenetics, Phylogenomics, and together with Kinetoplastea (trypanosomes), Diplonemea (genera Diplonema and Rhynchopus), Systematics, and Symbiontida, form the phylum Euglenozoa (Cavalier-Smith, 1981, 1993; Yubuki et al., 2009; a section of the journal Breglia et al., 2010). The phylum Euglenozoa is well-supported in molecular analyses. The most Frontiers in Ecology and Evolution prominent common features of this clade are the polycistronic transcription, massive trans- Received: 11 February 2015 splicing, and more rarely the absence of introns (Flegontov and Lukeš, 2012). The members Accepted: 16 February 2016 of Kinetoplastea are free-living and obligatory parasitic protists that have cells with extensive Published: 16 March 2016 mitochondrial DNA, termed kinetoplast or DNA kinetoplast; whereas Diplonemea or diplonemids Citation: may be free-living phagotrophs or facultative parasites, with sack-shaped cells and short, thin Bicudo CEdM and Menezes M (2016) flagella (Roy et al., 2007; Adl et al., 2012). The Symbiontida includes organisms living in low-oxygen Phylogeny and Classification of Euglenophyceae: A Brief Review. sediments; their cells possess rod-shaped epibiotic bacteria (Breglia et al., 2007; Adl et al., 2012). All Front. Ecol. Evol. 4:17. these groups share morphological features including paraxial rods, a regular array of longitudinal doi: 10.3389/fevo.2016.00017 subpellicular microtubules, and closed mitosis (Simpson, 1997). Frontiers in Ecology and Evolution | www.frontiersin.org 1 March 2016 | Volume 4 | Article 17 Bicudo and Menezes Phylogeny and Classification The advent of molecular studies and the increasing of the which exhibit a single highly branched mitochondrion, with a few number of genes and DNA regions used in the phylogenetic flat, lamellar cristae, and mitochondrial DNA arranged in circular studies led to a restructuring of the taxonomy of Euglenophyceae, chromosomes of two slightly different sizes (Marande et al., 2005; improved understanding of the phylogenetic positions of the Roy et al., 2007). genera and several species, and helped to deduce the phylogenetic The Symbiontida is a more recently described clade, which relationships within the group. shares typical characters with the Euglenozoa and also shows The present article summarizes the main information on features not previously described for this group, such as modified the phylogenetic position and taxonomic classification of the (hydrogenosome-like) mitochondria, an “extrusomal pocket,” phototrophic euglenids. The current status and limitations the highly organized extracellular matrix underneath epibiotic derived from the lack of inclusion of tropical strains in bacteria, and the complex flagellar transition zone (Yubuki et al., phylogenetic studies of this group are also discussed. A glossary 2009). of terms used in this review is included at the end of the The phylogenetic relationships among euglenids, article. diplonemids, kinetoplastids, and symbiontids remain controversial. Studies on morphological features (e.g., shape of the feeding and flagellar apparatuses, mitosis pattern, PHYLOGENETIC POSITION OF and cytoskeletal composition) suggest that euglenids and EUGLENOPHYCEAE WITHIN kinetoplastids are more closely related (Triemer and Farmer, EUGLENOZOA 1991). On the other hand, studies combining morphological and molecular phylogenetic data suggest that kinetoplastids and Euglenida, together with the Kinetoplastea, Diplonemea, and diplonemids are sister groups, with euglenids branching basally Symbiontida, form the phylum Euglenozoa. Cells with two cilia, to the first two groups (Simpson and Roger, 2004; Marande inserted apically or subapically in a pocket, characterize the and Burger, 2007; Kiethega et al., 2011). The discovery of the phylum Euglenozoa. The cells have a basic ciliary apparatus Symbiontida raised the question of whether diplonemids and pattern consisting of two functional kinetosomes and three symbiontids might be more closely related to euglenids than to asymmetrically arranged microtubular roots, with paddle- kinetoplastids (Yubuki et al., 2013). shaped, discoid or flat mitochondrial cristae, tubular extrusomes, A phylogenetic analysis based on SSU rDNA sequences and closed mitosis with an intranuclear spindle (Simpson, 1997; showed the Euglenophyceae as a robust monophyletic clade, Roy et al., 2007; Adl et al., 2012). with Eutreptia and Eutreptiella as the basal lineages and Euglenozoa are monophyletic (Breglia et al., 2010; Burki, Rapaza viridis (mixotrophic species) branching as sister lineage 2014) and their clades are well-supported by morphological (Yamaguchi et al., 2012; Figure 2). Euglenophyceae together and molecular data (Simpson, 1997; Simpson and Roger, 2004). with Rapaza form a well-supported clade sister to the clade Table 1 summarizes the main differences among Euglenida, encompassing heterotrophic groups—Anisonema, Peranema, Kinetoplastea, Diplonemea, and Symbiontida. Dinema, Distigma, Rhabdomonas (with good support), and The phylum Euglenozoa is a well-defined group, however, Peranema trichophorum is basal to this whole clade. Other its relationship to other protists remains uncertain. The cell heterotrophic euglenids (Entosiphon, Pleotia, Petalomonas, structure, especially the presence of discoid mitochondrial Notosolenus) including Symbiontida are grouped together cristae, and multigene phylogenetic analyses have suggested without good support. that the Euglenozoa are close to the class Heterolobosea, a group represented by heterotrophic amoebae, amoeboflagellates and flagellates (Simpson et al., 2006; Grant and Katz, 2014). CHANGES IN THE TAXONOMIC Information on ultrastructure and phylogeny suggests that both CLASSIFICATION OF EUGLENOPHYCEAE lineages are members of the supergroup Excavata (Hampl et al., 2009; Yabuki et al., 2011; Figure 1). Early Studies The Euglenida comprise a group of predominantly free- The euglenids are part of an extremely diverse lineage of living organisms characterized by a typical cell cover made flagellate protists (Marin et al., 2003). Ehrenberg (1830) of parallel proteinaceous strips and microtubules located first attempted to classify euglenids, when he described the underneath the plasma membrane, the pellicle; and encompasses genus Euglena. Ehrenberg (1830), keeping within his self- phototrophic, heterotrophic (osmotrophic and phagotrophic), created classification system, placed the new genus among and mixotrophic species (Leander et al., 2007; Yamaguchi et al., the Polygastrica of family Astasiae, i.e., multi-stomached 2012). creatures with no alimentary canal, variable body shape, but The Kinetoplastea includes parasitic species and free-living no pseudopods or lorica. Subsequently, several investigators bodonids, which have mitochondrial inclusions of distinctively added descriptive characteristics for the genus Euglena and arranged DNA molecules, termed a kinetoplast DNA or kDNA, established different classification systems
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